Lock slider for slide fasteners



Sept. 11, 1962 Filed Jan. 29, 1959 Will 1mm JL LA MOINE E. JOHNS LOCK SLIDER FOR. SLIDE FASTENERS 2 Sheets-Sheet 2 JaMa/fle A". Jab/7s ATTORNEY United States Patent Ofiice e 3,052,939 Patented Sept. 11, 1962 3,052,939 LOCK SLIDER FOR SLIDE FASTENERS La Moine E. Johns, Westfield, N.J., assiguor to Conmar Products Corporation, Newark, N.J., a corporation of New Jersey Filed Jan. 29, 1959, Ser. No. 789,886 Claims. (Cl. 24205.14)

This invention relates generally to slide fasteners and, more particularly, to a new and improved lock slider therefor.

One important aim and object of the present invention is the provision of an improved lock slider for slide fasteners which is relatively thin and compact, producing a neat and aesthetically attractive appearance, simple in construction, easy to assemble, and which is positive and reliable in locking action, coupled with great strength and durability. Pursuant to this object of the present invention, the lock slider includes a resilient locking member which is assembled to the slider body from the inside thereof to achieve a strong assembly in which it is virtually impossible to dislodge or pull off the locking member by excessive stress applied through the pull member. The pull member has an intermediate unlocked position and is rotatable therefrom in two opposite directions to two locking positions, respectively, the pull member coacting with the locking member to provide for snap movement of the pull member to such locking positions on predetermined rotation thereof from the unlocked position. Only a minimal portion of the locking member is exposed above the slider body and the locking member substantially fills the cutaway inner surface of its companion slider wing, providing protection for the locking member and eliminating scoop entrapments within the slider body.

Another object of the present invention is the provision of a slider of the aforenoted character which is capable of withstanding high compressive forces Without damage to the slider or overlying plies of material of the garment or article in which the slider is incorporated. Pursuant to this object of the present invention an iron or other pressing instrumentality may be applied to the slider with the pull member in either locking position, without danger of damage to the slider or its components, the compressive forces of the iron being transmitted to the slider body, which is capable of withstanding such forces.

Another object of the present invention is the provision of a slider of the aforenoted character having provision for positively limiting pull member lateral twist in the locked positions thereof to achieve a strong and durable slider assembly.

Another object of the present invention is the provision in a slider of the aforenoted character of an improved locking member which is assembled with the slider body in an improved manner to achieve a strong and durable assembly. A feature of the present invention is the manner of retaining or capturing the locking detent of the locking member in a prescribed orientation to insure a positive and reliable locking action, coupled with long life.

Yet another object of the present invention is the provision of a generally improved slider of the aforenoted character which is of simple and economical construction, having great inherent strength with unique slimness and attractiveness.

To accomplish the foregoing objects and such other objects as may hereinafter appear, my invention relates to a slide fastener and, more particularly, a slider component as described in the following specification taken together with the accompanying illustrative drawings in which:

FIG. 1 is a fragmentary plan view of a slide fastener having a slider formed in accordance with the present invention;

FIG. 2 is a top plan view of the slider with portions of the locking and pull members broken away to reveal structural details;

FIG. 3 is a perspective view of the locking member and slider body, the latter being in strip form in an intermediate stage of manufacture;

FIG. 4 is an enlarged fragmentary plan view of the slide fastener, with the top wing of the slider broken away to expose the internal channel of the slider;

FIG. 5 is an enlarged vertical sectional view of the slider taken on line 55 of FIG. 1, the slider being shown in a locked condition;

FIG. 6 is a view similar to FIG. 5, with the slider shown in an unlocked condition;

FIG. 7 is a sectional view taken on the line 7-7 of FIG. 5;

FIG. 8 is a top plan view of the blank from which the locking member is fabricated;

FIG. 9 is a top plan view of the pull member;

FIG. 10 is a view similar to FIG. 5, showing another embodiment of the present invention in which a recessed pull member is utilized;

FIG. 11 is a sectional view, on an enlarged scale, taken on the line 11-11 of FIG. 10; and

FIG. 12 is a perspective view of the pull member of the embodiment of FIGS. 10 and 11.

Referring to the drawings, and more particularly to FIG. 1 thereof, the slide fastener comprises the usual pair of stringers 10, each consisting of a tape 12 having a beaded or raised edge 14 along which are provided a series of spaced, interlockable fastener elements or scoops 16. The slide fastener elements are engaged and disengaged by the up and down movement of the slider generally designated 18. The slider 18 of the present invention is of the locking type and consists of three parts a slider body 20, a resilient locking member 22, and a pull member 24, which are assembled in the manner to be described in detail hereinafter.

Referring to FIGS. 1 through 9, the slider body 20 comprises front and rear wings 26 and 28, respectively, connected by a neck portion 30, each of the wings being provided with a pair of curved rails or inturned side flanges 32 and 34. The slider wings and inturned side flanges define a substantially Y-shaped internal channel 36 for the meshing and unmeshing of the interlockable elements 16. The front wing 26 is provided with a recess 38 at the underside thereof and a pair of spaced, outstruck lugs 40 and 42 which overlie said recess and define an opening 44 therebetween. The resilient locking member 22 is seated and secured in the recess 38 in a manner to be described in detail hereinafter and has a flat loop portion 46 extending through the opening 44, and a locking detent 48 which is normally projected into engagement with the interlockable elements or scoops in the channel 36 for locking the slider.

As shown in FIG. 3, the locking member 22 is as sembled to the slider body while the latter still is in strip form in an intermediate stage of manufacture. The slider body, in strip or flat form 20, is formed to provide a recess 38 and heavy rigid lugs 44) and 42 in the front wing part 26', the latter additionally being provided With an opposite pair of recessed portions 50' adjacent the recess 38. The locking member 22 is assembled to the wing part 26 in the manner to be described from the underside thereof, and thereafter the wing parts 26' and 28 are bent into generally U-shaped slider configuration, with said wing parts being in coextensive overlying relation, as best shown in FIGS. 5 and 6.

Referring now to the locking member 22, the latter is of one-piece construction and may be formed of any suitable material having the requisite resilient characteristics, said locking member being formed from a flat blank 52, shown in FIG. 8, which is bent in any suitable manner to the finished configuration shown in FIG. 3. The looking member 22 comprises, upper and lower walls 54'and 56, respectively, the upper wall 54 having wall portions 58 and 60 which are disposed in offset planes. The upper and lower walls are provided with a curved, resilient interconnecting portion 62, the latter acting as a resilient hinge at one side thereof, with the opposite side thereof being normally biased into engagement by the resilient portion 62. The loop portion 46 extends outwardly from the wall portions 58 and 60, and wall portion 58 has the locking detent 48 projecting downwardly therefrom remote from the resilient portion 62. The lower wall 56 has a projecting tab 64 in the plane thereof which defines a lateral stop at one side of the locking detent 48. The lower wall 56 is provided with outwardly projecting flanges or wings 66 which are turned upwardly from the plane of said lower wall towards loop portion 46, said flanges 66 being adapted to be secured in recessed portions 50 for assembling the locking member in recess 38.

The blank 52 is of generally rectangular configuration and is provided with outwardly projecting flanges 66' which are bent out of the plane of said blank to form the flanges 66 of the locking member. The flange 48' projecting longitudinally of the blank is suitably bent to define the locking detent 48 of the locking member, and

the diagonally opposite flange 64' defines the lateral stop 64 of the locking member. The fold lines in bending blank 52 to the configuration shown in FIG. 3 are indicated in broken lines in FIG. 8. More particularly, the loop portion 46 is defined between fold lines 68 and 70, the fold lines 78 and '80 defining the upper corners of the loop portion. The resilient portion 62. is defined between the fold lines 72 and 74. Flange 48' is bent along the fold line 76 to form the locking detent 48, the latter being disposed substantially at right angles to the Wall portion 58. The locking member 22 thus formed (FIG. 3) is seated in recess 38 of body 20, with the flanges 66 disposed in the recessed portions 50. The locking member is preferably secured in position by a staking operation in which marginal portions 82 of the wing 26 adjacent the recessed portions 50' are upset by a suitable tool to form locking flanges 84 (FIG. 7) which are clamped against the flanges 66. Thus the flanges 84 r overlie the flanges 66 to clamp the latter in the recessed portions The recessed portions'50' subsequent to the aforedescribed staking operations are of the configuration generally designated 5 0 in FIG. 7.

The pull member 24, which may be of any suitable design and construction, is provided with laterally spaced legs 86 (FIG. 9) having inwardly extending aligned trunnions 88 having cam surfaces 89 (FIGS. 5 and 6), which are engaged in loop portion 46 of the locking member. In practice, the legs 86 and trunnions 88 are initially spread apart to permit straddling'of the trunnions around loop portion 46, and thereafter the legs 86 are squeezed into substantial parallelism as shown in FIG. 9 to engage the trunnions 88 in said loop portion. The trunnions 88 are of generally rectangular cross-section and are elongated in the plane of the pull member as shown in FIG. 5 to obtain the desired lift of locking detent 48. The corner portions thereof may be chamfered or rounded,'as indicated at 90. In the rotation of the pull member, the terminal rounded edges 92 (FIGS. 2 and 9) of legs 86 fulcrum on the outer face 94 (FIG. 2) of the slider body.

The slider may be locked with the pull member 24 extending downwardly of'the slider as shown in FIGS. 1 and 5, or may be locked with the pull member oppositely disposed or in. an upwardly extending direction. In a locking position of the pull member as shown in FIG. 5,

the locking detent 48 extends into the slider channel in locking engagement between interlockable elements 16.

It will be noted that the pull member extends in substantially parallel relation with the slider body in either locking position, and that the loop portion 46 provides slight clearance (or even no clearance) for the trunnions 88 in such locking positions. The pull member is rotatable from either locking position to an unlocking or intermediate position, indicated at 24' in FIG. 6 to concomitantly raise the locking detent 48 outwardly of the internal slider channel to an unlocked position. It will be understood that the pull member in such rotation cams against the outer face 94 of the slider body and tensions or spreads the resilient hinge portion 62 of the locking member. The pull member is disposed substantially perpendicular to the body in its unlocking position, and is releasably retained or indexed thereat by coaction between the flat end edges 92 of the pull and the surface 94 of the slider, and also the flat cam surfaces 89 of the trunnions and the flat loop portion 46. On predetermined rotation of the pull member from such unlocked position, for example on rotation to the intermediate broken line position indicated at 24" as shown in FIG. 6, the spring action of the locking member will overcenter and thereupon bias the pull member to a corresponding locking position. On such predetermined rotation of the pull member from the unlocking position, the pull member will snap down to a corresponding locking position so that the slider may be readily changed from unlocked to locked position by a flip of the pull member in either direction. Thus the locking detent 48 will automatically move into locking engagement with the scoops on predetermined movement of the pull member from the unlocked position.

In a locked position of the pull member the laterally spaced legs 86 thereof interfit with one of the lugs 40, 42, the latter defining a stop limiting the lateral twist of the pull member in the plane thereof. Thus in the downwardly extending locked position of the pull member, as shown in FIGS. 1 and 5, said pull member will cooperate with lug 40 to limit lateral twist of the member, and in the opposite locked position of the pull member the lug 42 will function in a corresponding manner to limit lateral twist of the pull member. As shown in FIG. 5, the lugs and pull member are disposed approximately in alignment or approximately in a common plane in the locked position of the pull member, the lugs extending slightly above such pull member. The loop portion 46 is disposed above the plane of the lugs and pull member a small amount substantially corresponding to only the thickness of the material of the locking member. Pursuant to this construction, compressive forces applied to the slider are distributed over a relatively large surface area thereof for transmission to the slider body. Compressive forces applied to the slider by an iron or other pressing ifistrumentality will be applied to the sturdy protective lugs 40, 42 and the pull member, the compressive forces applied to the loop portion 46 being transmitted to the pull member through the trunnions and in turn by the pull to the slider body. Thus compressive forces will be applied over a relatively large surface area of the slider for distribution to and absorption by the slider body, which is capable of withstanding such compressive forces. Relatively high compressive forces may be applied to the surface of the slider without danger of damage to the locking member or overlying plies of textile material in the garment or article in which the slider is incorporated. If fabric overlies the slider during pressing the fabric is not injured because it is pressed against flat ratherthan sharp surfaces.

On rotation of the pull member to unlocked position 24', the wall portion 58 of the locking member will be raised towards lug 40, as shown in FIG. 6, and will be slightly spaced therefrom. The lugs 40 and 42 act as stops to limit maximum outward displacement of the wall portions 58 and 60 on undue outward stress applied to the locking member through the pull member. Thus, pursuant to the. instant construction, excessive pull-01f stresses applied to the pull member will be resisted by the lugs 49 and 42 so as to prevent damage to the locking member. It will be noted that the locking detent 48 is spaced at a greater radius from the hinge portion 62 than the coacting surfaces between the loop portion and trunnions so that the locking detent will be lifted a proportionally greater amount than the loop member on pivotal movement of the pull member to the unlocked position. Thus the locking detent movement is controlled so as to obtain the requisite lift to clear the scoops, with the loop member lift being a proportionately lesser amount.

As aforenoted, the locking member is assembled to the slider body from the inside thereof so that it is virtually impossible to dislodge or pull off the locking member by excessive stress applied through the pull member. Only a minimal portion of the locking member, namely, the loop portion 46 thereof, is exposed above the slider body, and the locking member substantially fills the cutaway inner surface of the slider wing 26 so as to provide protection for the locking member and eliminate scoop entrapments within the slider body. The bottom wall 56 of the locking member is substantially coextensive with the recess 33 so as to form with the adjacent surface of the wing 26 a substantially continuous wall whereby to eliminate scoop catches or traps in the internal channel of the slider. The wall 56 and the adjacent surface of the slider wing are disposed in flush relation as shown in FIGS. 5 and 6.

As aforenoted, the slider may be locked with the pull member in either of two opposite positions, and it will be apparent that a garment having such a slider may be pressed with the pull member in either of said positions without damage to the slider or its components. The locking detent 48 is captured or retained in a prescribed lateral orientation to insure positive and reliable locking action. More particularly, the projecting tab 64 defines a lateral stop at one side of the locking detent, and a side wall portion 6 of the recess 38 defines a lateral stop for the locking detent at the opposite side thereof, whereby the locking detent is restrained against lateral displacement.

Referring now to FIGS. 10 through 12, there is shown a modified form of slider 100 which differs from the slider 18 described above in regard to the pull member 102 which is of symmetrically recessed construction. The pull member 102 is provided with an opposite pair of symmetrically arranged longitudinal recesses 164 defining a pair of thickened longitudinal slider rails 106. The locking member and slider body assembly corresponds in all respects to the assembly of the previous embodiment. The longitudinal rails 106 of the pull member in the locked position thereof project above the loop portion 46 of the locking spring as shown in FIG. 11 so that compressive forces applied to the slider will be transmitted to the slider body through the pull member rails. Expressed differently, the rails extend above the loop portion 46 and protect the latter against compressive stresses applied to the slider. Accordingly, a planar or fiat pull member, such as pull member 24, or a recessed pull mem ber such as pull member 162 may be utilized in the slider of the present invention. The trunnions 108 of the pull member are disposed medially of the height or thickness of the rails. In all other respects the pull member 102 corresponds to the pull member 24 previously described. The trunnions 168 of the pull member 102 correspond to the trunnions 88 previously described and extend inwardly from the rails in aligned relation for cooperation with the loop portion 46 of the locking member as previously described. The rails 106 define therebetween an opening 110 to receive one of the lugs 40, 42 in a locked position of the pull member, the rails interfitting with a companion lug to limit lateral twist of the pull member in the manner previously described.

From the above it will be apparent that the slider of the present invention presents a neat and aesthetically at- 6 tractive appearance, and is positive and reliable in locking action, coupled with great strength and durability. A garment or other article having such slider incorporated therein may be pressed with the pull member in either locked position, and the locking member is protected against danger of damage by excessive compressive forces applied to the slider. Thus the slider is uniquely slim and attractive, having great inherent strength and ruggedness achieved by the novel structural features described above.

It is believed that the construction and operation of the slider of my invention, as well as the advantages thereof, will be apparent from the foregoing detailed description. It will also be apparent that while I have shown and described my invention in its preferred form, changes may be made in the structure disclosed, without departing from the scope of my invention, as sought to be defined in the following claims.

I claim:

1. A slider for slide fasteners of the type having two stringers with a series of spaced, interlockable elements, said slider comprising a body having a front wing and a rear wing spacedly connected at one end, and further comprising inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing having outstruck lugs defining an opening therebetween and a recess therebelow, a resilient locking member seated in said recess and having a loop portion extending through said opening and a locking detent normally projected into engagement with interlockable elements in said channel, and a pull member having trunnion means extending in said loop portion and said pull member being movable from a locked position in which said locking detent is in said projected position to an unlocked position in which said loop portion is resiliently raised by said trunnion means to concomitantly raise said locking detent to a retracted unlocked position, said locking member having upper and lower walls provided with a curved resilient interconnecting portion at one side thereof with the opposite side thereof being normally biased into engagement by said resilient portion, said locking detent projecting downwardly from said upper wall, and said lower wall having a projecting tab in the plane thereof defining a lateral stop for said locking detent.

2. A slider for slide fasteners, comprising a slider body having spacedly connected wings defining an internal channel for meshing and unmeshing interlockable elements, one of said wings having a recess at the underside thereof and a pair of spaced outstruck lugs overlying said recess and defining an opening therebetween, a re silient locking member seated in said recess and having a loop portion extending through said opening and a locking detent normally projected into engagement with interlockable elements in said channel, and a pull member having trunnion means extending in said loop portion and said pull member being movable from a locked position in which said locking detent is in said projected position to an unlocked position in which said loop portion is resiliently raised by said trunnion means to concomitantly raise said locking detent to an unlocked position,

said locking member having upper and lower Walls provided with a curved resilient interconnecting portion at one side thereof with the opposite side thereof being normally biased into engagement by said resilient portion, said locking detent projecting downwardly from said upper wall, and said lower wall having a projecting tab in the plane thereof defining a lateral stop at one side of said locking detent, a side wall portion of said recess defining a lateral stop for said locking detent at the opposite side thereof.

3. A slider for slide fasteners of the type having two stringers with a series of spaced, interlockable elements, said slider comprising a body having a front wing and a rear wing fixedly connected at one end, and further comprising inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing having outstruck lugs defining an opening therebetween and recesses therebelow, a locking member comprising a single strip of resilient sheet metal forming a flat bottom and reversely bent at one end of said bottom to provide a ledge above one end of the bottom, the reverse bend acting as a resilient hinge, the remainder of said strip forming a loop projecting upwardly from the ledge, an opposite ledge at the other end of the loop overlying the bottom, and a locking detent projecting from the latter ledge downward below the bottom, said bottom being cut away at one corner to pass said detent, said locking member being received with the loop in said opening and with the ledges in said recesses and with the bottom substantiallyflush with the inside face of the front wing, and a pull member having trunnions extending into said loop and said pull member being movable from a locking position to an unlocking position in which said loop portion is raised by said trunnions in order to retract said locking detent.

4. A slider for slide fasteners of the type having two stringers with a series of spaced, interlockable elements, said slider comprising a body having a front wing and a rear wing fixedly connected at one end, and further comprising inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing having an opening, the sides of the opening being recessed at the bottom to provide anchoring recesses, a locking member comprising a single strip of resilient sheet metal forming a flat bottom and reversely bent at one end of said bottom, the reverse bend acting as a resilient hinge, the remainder of said strip forming a loop projecting upwardly and a locking detent projecting downward below the bottom, the side edges of said bottom projecting outward to provide anchoring flanges, said locking member being received with the loop in said opening and with the anchoring flanges in the anchoring recesses and with the bottom substantially flush with the inside face of the front slider wing, the latter being staked over the anchoring flanges to anchor the bottom of the lock member in position, and a pull member having flattened trunnions extending into said loop portion and being rotatable from a locking position to an unlocking position in which said loop portion is raised by said trunnions in order to retract said locking detent.

5. A slider for slide fasteners of the type having two stringers with a series of spaced, interlockableelements, said slider comprising a body having a front wing and a rear wing fixedly connected at one end, and further comprising inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing having outstruck lugs defining an opening therebetween and recesses therebelow, the sides of the opening being recessed at the bottom to provide anchoring recesses, a

locking member comprising a single strip of resilient sheet. metal forming a flat bottom and reversely bent at one end of said bottom to provide a ledge above one end of the bottom, the reverse bend acting as a resilient hinge, the remainder of said strip forming a loop projecting upwardly from the ledge, an opposite ledge at the other end of the loop overlying the bottom, and a locking detent projecting from the latter ledge downward below the bottom, said bottom being cut away at one corner to pass said detent, the side edges of said bottom projecting outward to provide anchoring flanges, said locking member being received with the loop in said opening and with. the ledges in said recesses and with the, anchoring flanges in the anchoring recesses and With the bottom substantially flush with the inside face of the front slider wing, the latter being staked over the anchoring flangessto anchor the bottom of the lock member in position, and a pull member having trunnions extending into said loop portion and said pull member being movable from a, locking position to an unlocking position in which said loop portion is raised by said trunnions in order to retract said locking detent.

6. A slider for slide fasteners of the type having two stringers with a series of spaced, interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing fixedly connected at one end, and further comprising inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing having outstruck lugs defining an opening therebetween and each having a recess therebelow, said lugs being sturdy flat topped lugs which project above the slider body an amount substantially the same as the thickness of the pull, said locking member comprising a single strip of resilient sheet metal forming a flat bottom and reversely bent at one end of said bottom to provide a ledge above one end of the bottom, the reverse bend acting as a resilient hinge, the remainder of said strip forming a fiat-topped loop projecting upwardly from the ledge, an opposite ledge at the other end of the loop overlying the bottom, and a locking detent projecting, from the latter ledge downward below the bottom, said bottom eing cut away at one corner to pass said detent, said locking member being received with the loop in said opening and with the ledges in said recesses and with the bottom substantially flush with the inside face of the front wing, said pull member having flattened trunnions extendinginto said loop and being rotatable from a locking position to an unlocking position in which said loop portion is raised by said trunnions in order to retract said locking detent.

7. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing being formed with a recess at the underside thereof and with a pair of spaced outstruck legs overlying said recess, said lugs defining an opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, and said pull member straddling one of said lugs and having trunnions extending into said loop portion and being movable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent.

8. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said'parts providing a substantially Y-shaped internal channel, said front wing being formed With a recess at the underside thereof and with a pair of spaced outstruck legs overlying said recess, said lugs defining an opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, said pull member straddling one of said lugs and having trunnions extending into said loop portion and being movable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent, and the metal at the side edges of said recess being staked over the side edges of a part of said locking member to secure the locking member to the underside of the front wing.

9a A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front Wing being formed with a recess at the underside thereof and with a pair of spaced outstruck lugs overlying said recess, said lugs defining an opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, said pull member straddling one of said lugs and having trunnions extending into said loop portion and being movable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent, and said lugs being sturdy flat-topped lugs which project above the slider body an amount approximately the same as the thickness of the pull member.

10. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said parts providing a substantially Y- shaped internal channel, said front Wing being formed with a recess at the underside thereof and with a pair of spaced outstruck lugs overlying said recess, said lugs defining an opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, said pull member straddling one of said lugs and having trunnions extending into said loop portion and being movable from a locked position to an unlocked position in which said loop portion is raised by said tninnions against the resilient action of said locking member in order to retract the detent, said lugs being sturdy flat-topped lugs, and the top of said loop portion having approximately the same height as the tops of the lugs.

11. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking memher, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front Wing being formed with a recess at the underside thereof and with a pair of spaced outstruck lugs overlying said recess, said lugs defining a rectangular opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion with a rectangular top extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, said loop portion and said lugs having substantially the same width, and said pull member straddling one of said lugs and part of said loop portion and having trunnions extending into said loop portion and being movable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent.

12. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front Wing being formed with a recess at the underside thereof and with a pair of spaced outstruck lugs overlying said recess, said lugs defining an opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, said pull member straddling one of said lugs and having trunnions extending into said loop portion and being movable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent, said lugs being sturdy flattopped lugs which project above the slider body an amount approximately the same as the thickness of the pull member, said loop portion and said lugs having substantially the same width, the top of said loop portion having approximately the same height at the tops of the lugs, and a part of said locking member being fixedly secured to the underside of the front wing.

13. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing being formed with a recess at the underside thereof and with a pair of spaced outstruck lugs overlying said recess, said lugs defining an opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, said pull member straddling one of said lugs and having flattened trunnions extending into said loop portion and being rotatable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent, said lugs being sturdy flat-topped lugs which project above the slider body an amount approximately the same as the thickness of the pull member, and the top of said loop portion having approximately the same height as the tops of the lugs.

14. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear wing connected at one end and having inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front Wing being formed with a recess at the underside thereof and with a pair of spaced outstruck lugs overlying said recess, said lugs defining a rectangular opening therebetween, said locking member being no longer than said recess and being seated within and substantially filling said recess and having a loop portion with a rectangular top extending into and substantially filling said opening between said lugs and having a locking detent normally projecting into said channel, said loop portion and said lugs having substantially the same width, said pull member straddling one of said lugs and a part of said loop portion and having flattened trunnions extending into said loop portion and being rotatable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent, and the metal at the side edges of said recess being staked over the side edges of a part of said locking member to secure the looking member to the underside of the front wing.

15. A slider for slide fasteners of the type having two stringers with a series of spaced interlockable elements, said slider comprising a body, a resilient locking member, and a pull, said body having a front wing and a rear 1 1 wing connected at one end and having inturned side flanges, said parts providing a substantially Y-shaped internal channel, said front wing being formed with a recess at the underside thereof and with a. pair of spaced outstruck lugs overlying said recess, said lugs defining an opening therebetween, said locking member being no longe rthan said recess and being seated within and sub stantially filling said recess and having a loop portion extending into and substantially filling said opening between said lugs and having a locking detent normally projeoting into said channel, said pull member straddling one of said lugs and having flattened trunnions extending into said loop portion and being rotatable from a locked position to an unlocked position in which said loop portion is raised by said trunnions against the resilient action of said locking member in order to retract the detent, said lugs being sturdy fiat-topp lugs which project above the slider body an amount approximately the same as the thickness of the pull member, said loop portion and said said locking member to secure the locking member to the underside of the front wing. t

.. References Cited in the file of this patent UNITED STATES PATENTS 2,215,745 Sundback Sept. 24, 1940 2,360,437 Mikulas Oct. 17, 1944 2,622,296 Erdrnann Dec. 23, 1952 2,683,911 Backer July 20, 1954 2,913,795 Brown Nov. 24, 1959 FOREIGN PATENTS 1,157,918 France Sept. 19, 1955 432,088 Great Britain of 1935 

